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TH72002 Datasheet(PDF) 6 Page - Melexis Microelectronic Systems |
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TH72002 Datasheet(HTML) 6 Page - Melexis Microelectronic Systems |
6 / 20 page TH72002 315MHz ASK Transmitter 3901072002 Page 6 of 20 Data Sheet Rev. 007 June/07 2.7 Mode Control Logic The mode control logic allows two different modes of operation as listed in the following table. The mode control pin ENTX is pulled- down internally. This guarantees that the whole circuit is shut down if this pin is left floating. ENTX Mode Description 0 TX standby TX disabled 1 TX active TX enable 2.8 Timing Diagrams After enabling the transmitter by the ENTX signal, the power amplifier remains inactive for the time ton, the transmitter start-up time. The crystal oscillator starts oscillation and the PLL locks to the desired output fre- quency within the time duration ton. After successful PLL lock, the LOCK signal turns on the power amplifier, and then the RF carrier can be ASK modulated. Fig. 4: Timing diagram for ASK modulation low low high high LOCK ASKDTA RF carrier t low high ENTX t on |
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